US3642363A - Manifold imaging system - Google Patents

Manifold imaging system Download PDF

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Publication number
US3642363A
US3642363A US872850A US3642363DA US3642363A US 3642363 A US3642363 A US 3642363A US 872850 A US872850 A US 872850A US 3642363D A US3642363D A US 3642363DA US 3642363 A US3642363 A US 3642363A
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Prior art keywords
electrode
layer
spool
tape
receiver
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Expired - Lifetime
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US872850A
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English (en)
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James R Davidson
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Xerox Corp
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Xerox Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G17/00—Electrographic processes using patterns other than charge patterns, e.g. an electric conductivity pattern; Processes involving a migration, e.g. photoelectrophoresis, photoelectrosolography; Processes involving a selective transfer, e.g. electrophoto-adhesive processes; Apparatus essentially involving a single such process
    • G03G17/08—Electrographic processes using patterns other than charge patterns, e.g. an electric conductivity pattern; Processes involving a migration, e.g. photoelectrophoresis, photoelectrosolography; Processes involving a selective transfer, e.g. electrophoto-adhesive processes; Apparatus essentially involving a single such process using an electrophoto-adhesive process, e.g. manifold imaging

Definitions

  • ABSTRACT A manifold set of donor layer, imaging material layer and receiver layer is formed between a backing electrode and a tape electrode.
  • the tape electrode is initially wound on a [52] spool and is laid out over the various layers of the manifold set [51] Int. Cl. ..G03g 15/00 by unwinding it from the SPOOL
  • the imaging material is [58] Field Of Search ..355/3, 16, i7 posed to elecuomagletic radiation and subjected 0 electric References Cited field.
  • a new imaging system herein referred to as a manifold imaging system has been devised wherein an image is formed by stripping apart donor and receiver sheets between which an imaging material resides.
  • the imaging material is divided between the donor and receiver sheets during their separation by virtue of preferential adhesion of the imaging material to one or the other sheet.
  • the preferential adhesion of the imaging material for the donor or receiver layer results from exposing the imaging material to electromagnetic radiation and subjecting it to an electric field.
  • the imaging material includes photosensitive particles dispersed in a binder.
  • the imaging material is cohesively weak or structurally fracturable.
  • the cohesive force of the imaging material is less than the adhesive force of the material with either the donor or receiver sheets.
  • the imaging material has a stronger adhesive attraction for the donor layer hence giving rise to the name donor sheet.
  • the adhesive attraction between the imaging material and the receiver layer is greater in areas exposed to radiation hence giving rise to the name receiver sheet.
  • Voltage potentials are coupled to the donor and receiver sheets when the sheets are separated and the imaging material is divided between them yielding positive and negative images. The polarity of the voltages and the shape of the electromagnetic radiation (or alternatively the shape of the electric field) determine on which of the two sheets the positive and negative images are formed.
  • the imaging material is more strongly attracted to one abutting sheet than the other is that the photoresponsive material exposed to electromagnetic radiation, e.g., visible light, and that not exposed to the radiation tend to move in opposite directions under the influence of the applied electric field. Since the material is fracturable at time of separation, the imaging material is selectively transferred to the donor and receiver sheets in complementary imagewise configurations.
  • the instant invention provides a solution for forming a manifold set of donor layer, imaging material and receiver layer.
  • the invention proposes novel means for applying afield across the manifold set, for separating the layers of the set to obtain the desired images and for advancing new materials into place for formation of a subsequent manifold set.
  • Another object of this invention is to feed separate layers together to form a manifold set, to cover the manifold set with electrodes for establishing an electric field across it, to strip apart or separate the layers of the manifold set and to eject the processed layers from the system.
  • Yet another object of this invention is to devise novel and versatile methods and apparatus for obtaining intimate contact between the layers of a manifold set.
  • Still another object of the present invention is to devise novel means and methods for separating the layers of a manifold set.
  • Even a further object of the present invention is to rapidly and efficiently move webs from separate reels into intimate contact, strip the webs apart, move one web onto another reel and cut and eject the other web.
  • Atmospheric pressure acts in the same direction as the mechanical force of the spool and the electrical force of a field to 1 5 maintain the various layers of the manifold set in intimate contact.
  • the backing electrode and donor webs are transparent to allow the imaging material to be exposed to the actinic electromagnetic radiation in imagewise configuration.
  • a voltage potential is coupled between the backing and tape electrodes.
  • the receiver web After exposure, the receiver web is pulled away from the donor web during the winding of the tape electrode resulting in the formation of complementary images on the receiver and donor webs. Means are provided to eject the used portions of the donor and receiver webs and to bring new materials into place for the formation of a subsequent image.
  • FIG. 2 is a schematic side elevation view of the present manifold imaging system
  • FIG. 3 is a schematic illustration of the tape electrode being unwound from the spool
  • FIG. 4 is a schematic illustration of the tape electrode being wound onto its spool and the receiver web being separated from the donor web;
  • FIG. 5 is a cross-sectional view of the manifold set taken along the lines 5-5 in FIG. 2;
  • FIG. 6 illustrates apparatus for supporting the spool on which the tape electrode is wound.
  • FIG. 1 illustrates a manifold set 1 used in manifold imaging systems.
  • Manifold set 1 includes the transparent substrate or donor layer 2 on which is deposited the layer of imaging material 3.
  • the receiver layer 4 is brought into contact with the imaging layer to complete the formation of the manifold set.
  • the imaging material 3 comprises the photosensitive particles 5 dispersed in a binder 6.
  • the imaging material has good cohesive strength prior to imaging in order to facilitate its handling and storage. In such cases, the cohesive strength of the imaging material is weakened prior to formation of the manifold set by softening the material by heating or applying a solvent.
  • the material is softened by spraying a solvent onto the imaging material with the atomizer 9.
  • the material is softened until its cohesive strength is reduced sufficiently so that the application of electric field combined with the action of actinic radiation on the electrically photosensitive materials will fracture the layer upon separation of the manifold set. Further, the layer must respond to the application of field the strengthiof which is below that field strength which will cause electrical breakdown or arcing across the layer.
  • the material is softened until its cohesive strength is less than the adhesive force between itself and either the donor or receiver layer.
  • the imaging material is said to be structurably fracturable when softened the prescribed amount.
  • the receiver and donor layers are electrically insulating. Consequently, an electric field is established across the manifold set by contacting the receiver and donor layers with electrically conductive electrodes between which a voltage is applied.
  • the field can also be established by depositing charge with a corotron on one layer and backing the other layer with a grounded electrode.
  • the receiver and donor layers themselves can be conductive in which case voltage potentials could be coupled directly to them. This is permissible because the binder 6 is normally electrically insulating.
  • the imaging material 3 may be exposed to electromagnetic radiation through either the donor or receiver layer.
  • the arrows 10 represent electromagnetic radiation being directed onto the imaging material through the donor layer.
  • the imaging material divides between the two layers.
  • the imaging material exposed to radiation adheres to the receiver layer and the unexposed material adheres to the donor layer.
  • the separation takes place while the electric field is applied.
  • One theory proposed to explain the division of the imaging material between the two abutting layers is that the photosensitive particles 5 exposed to the radiation tend to move under the influence of the field. The tendency to move creates stresses within the imaging material that alter the adhesive bond with the layer away from which the particles tend to move.
  • the cohesively weak nature of the imaging material is believed to explain why the fracture extends substantially the full thickness of the imaging material.
  • the copending application Ser. No. 609,057 fully sets forth representative compounds and materials which can be used in forming the manifold imaging process.
  • the donor substrate or layer and the receiver layer may preferably consist of a suitable insulating material.
  • Typical insulating materials include polyethylene, polyethylene terephthalate, cellulose acetate, paper, plastic-coated paper, such as polyethylenecoated paper, and mixtures thereof.
  • Suitable activating fluids, i.e., solvents may include any material which will reduce the cohesive strength of the imaging material.
  • Typical materials include kerosene, carbon tetrachloride, petroleum ether, silicone oils, etc.
  • the imaging layer may comprise any typical photoresponsive material in a binder.
  • Typical photoresponsive material includes photoconductors such as substituted and unsubstituted phthalocyanine; quinacridones; zinc oxide, mercuric sulfide, etc.
  • Binder materials may include insulating resins such as polyethylene, polypropylene, etc.
  • the present imaging system includes the backing electrode 12 and the tape electrode 13 wound on spool 14.
  • the manifold set includes the donor web 15 and receiver web 16 and is formed between the electrodes, exposed to electromagnetic radiation, subjected to an electric field and stripped apart to yield positive and negative images.
  • the backing electrode 12 is made from an optically transparent glass plate (it may be in a drum configuration) on which is deposited an optically transparent layer of tin oxide that is electrically conductive.
  • Conductive glass of the type described is available commercially under the trade name NESA glass.
  • the conductive layer of tin oxide is on the surface of the backing electrode closest to the tape electrode 13.
  • the tape electrode 13 is made from a conductive material that is flexible allowing it to be repeatedly coiled and uncoiled on spool 14.
  • the tape electrode is also elastic.
  • An example of a suitable elastic conductive material for the use as a tape electrode is 30 durometer buna-n synthetic rubber.
  • the tape electrode is anchored at its free end by an appropriate fastener 17 to enable the tape electrode to be unwound from the spool 14.
  • the other end of the tape electrode is coupled to the periphery of spool 14 to enable it to be wound onto the spool.
  • the spool is forced upward against the backing electrode either by a hand operation or by an appropriate support means.
  • the spool is moved along the length of the backing electrode while maintaining an upward force on the spool to lay the tape electrode against the backing electrode.
  • An appropriate support means might include an angled track such as the track 18 shown in FIG. 6 in which the spool axle 19 rides. Moving the spool by motor or by hand along the track 18 causes the spool to rotate and the tape electrode to be laid out. The angle of incline of the track 18 relative to the ba tking electrode is selected to cause the spool to force or compress the tape electrode against the backing electrode.
  • the spool and its support therefore compose a compression means for forcing the tape electrode against the backing electrode. When a manifold set is between the electrodes, the compression means helps establish intimate contact between the various layers of the manifold set. This aspect of the present invention is discussed again in connection with FIG. 5.
  • the donor web 15 includes a donor layer on which a layer of imaging material is deposited such as the layers 2 and 3 shown in FIG. 1.
  • the imaging material is rendered structurally fracturable (its cohesive strength is made less than the adhesive bond betweenit and the donor or receiver layer) by the application of a suitable solvent.
  • Roller 20 wets the surface of the imaging material on the web 15 and softens it to the point of rendering the material structurally fracturable.
  • the solvent is maintained at a level in tank 21 sufiicient to coat the periphery of the roller. As the web 15 moves past the roller 20, friction forces rotate roller 20 to coat the solvent onto the surface of the web. 4
  • the donor web 15 is coupled between the takeup reel 23 and the storage reel 25.
  • Appropriate drive means is coupled to the takeup reel to advance an unused portion of web 15 to a position adjacent the backing electrode 12.
  • the receiver web 16 is stored on the feed reel 24.
  • a fresh portion of receiver web is advanced from reel 24 by the pinch drive rollers 26 and 27.
  • the receiver web is guided to the nip (the area of contact between the tape and blocking electrodes) by the guide tray 29.
  • the spool 14 advances a short distance to trap the tip of the receiver sheet between itself and the backing electrode.
  • the spool then continues to move from left to right (as viewed in FIG. 2) along the length of the backing electrode laying out substantially the entire tape electrode or at least an amount sufficient to cover the area exposed to the electromagnetic radiation.
  • the unwindingof the tape electrode is schematically illustrated in FIG. 3.
  • the guide tray 29 is bent downward at point 30 to form the positive and negative sloped ramps 31 and 32.
  • the tray is biased by the coil spring 33 such that point 30 tends to contact the backing electrode.
  • the receiver web is separated from the manifold set at substantially the same rate at which the spool translates.
  • the capstan 36 is positioned such that the force exerted on the receiver web by the pinch rollers includes a downward-directed force component.
  • the vertical force component becomes smaller as the spool advances further to the left because the angle between the capstan and the spool relative to the horizon decreases.
  • the position of capstan 36 is selected so the vertical force component is sufficient to effect separation of the receiver sheet even when the spool is at its leftmost position.
  • the horizontal force component exerted on the receiver web is sufficient to pull the web from the grip of the two electrodes when the spool is returned to a position near its initial starting point.
  • the receiver web is severed by the knife edges on cutter bars 37 and 38, falls onto the ramp 32 of tray 29 and is ejected from the tray by gravity or an otherwise appropriate sheet-feeding mechanism.
  • the performance of the presently described manifold imaging system is improved if the layers of the manifold set are in intimate contact.
  • the imaging material is initially in intimate contact with the donor layer because it is deposited thereon.
  • the contact between the imaging material and the receiver layer is depended upon the action of the present imaging apparatus.
  • the receiver web is forced into contact with the imaging material layer in the present imaging system by at least three forces: one force being the mechanical force exerted by the spool against the tape electrode; another force is the electrical force established by the voltages coupled to the electrodes; and, the third force is the force exerted by atmospheric pressure.
  • gases present between the electrodes and the layers of the manifold set are expelled by the force exerted by the spool against the two electrodes.
  • FIG. 5 is a cross section of a manifold set formed between the backing and tape electrodes.
  • the donor web includes the donor layer 2 and imaging material 3 (the same as in FIG. 1).
  • the width of the donor and receiver webs are substantially the same.
  • the width of the tape electrode is greater than either the width of the donor or receiver web.
  • the greater width of the tape electrode allows for some misalignment between the various layers of the manifold set and the electrodes.
  • the tape electrode has a thin layer of insulating material 39 coated on its upper surface to prevent electrical shorting between the two electrodes. The tape electrode forms a seal between the two electrodes keeping atmospheric pressure acting on the manifold set.
  • the exposure of the manifold set to electromagnetic radiation is made by exposure means including the lamp 40, the transparency 41 and the lens 42.
  • the radiation produced by lamp 40 is selectively transmitted by transparency 41 in imagewise configuration, is collected by lens 42 and projected through the transparent donor layer to the imaging material.
  • the electric field used in the imaging system is established by an appropriate voltage source 43 coupled at one terminal to the tape electrode 13 and at a second terminal to a ground potential 44 and the ground potential 44 coupled to the backing electrode 12.
  • the donor web is tacked by electrostatic and other forces to the backing electrode.
  • the donor web is separated form the backing electrode by running a knife edge between the, puffing air between them, raising the backing electrode or by other appropriate means.
  • the used donor web is wound onto takeup reel 23 bringing a new portion of web 15 adjacent the backing electrode.
  • a new section of the receiver web is advanced to the nip between the two electrodes and the aforedescribed operation is repeated to form another image.
  • Imaging apparatus comprising backing electrode and a conductive elastic tape electrode having means for coupling to a volta e source to establish an electric field between them an to attract the tape electrode by electrical force toward the backing electrode,
  • compression means for forcing the tape electrode toward the backing electrode to form a structurably fracturable manifold set from a donor layer, an imaging material layer and a receiver layer positioned between the electrodes, and
  • exposure means for exposing the imaging material of a manifold set to electromagnetic radiation whereby the adhesive attraction between the imaging layer and donor and receiver layers is altered in areas exposed to radiation and subjected to electric field.
  • the apparatus of claim 1 further including means to weaken the cohesive strength of an imaging layer placed between said electrodes.
  • said backing electrode includes a transparent material for transmitting electromagnetic radiation to a transparent donor layer and an imaging layer.
  • the apparatus of claim 1 further including stripping means to separate the tape and backing electrodes and the receiver and donor layer to fracture an imaging layer between the electrodes in areas exposed to radiation and field yielding complementary images on said donor and receiver layers.
  • stripping means in-' cludes means to restrain the donor layer and backing electrode and to separate the tape electrode and receiver layer from the backing electrode and donor layer.
  • the apparatus of claim 5 further including means to separate a donor-layer from said backing electrode after an imaging layer has been fractured.
  • said compression means includes a spool member supported for travel relative to said electrodes and for forcing one electrode against the other during its travel driving out gases between the electrodes.
  • the apparatus of claim 1 further including a spool to which one end of said tape electrode is coupled for winding the electrode on the spool with the free end of the tape electrode anchored to facilitate unwinding of the tape electrode'from the spool, and
  • the apparatus of claim 8 further including means exerting a force on the receiver layer for separating the receiver layer from the tape electrode and a donor layer as the tape 50 electrode is wound onto said spool.
  • the apparatus of claim 8 further including first feed means for positioning adjacent the backing electrode a donor layer having an imaging layer deposited thereon;
  • second feed means for positioning a receiver layer adjacent the imaging layer before the tape electrode is unwound from the spool whereby the compression means and electrical field forces the receiver layer into contact with the imaging layer as the tape electrode is unwound from the spool.
  • said second feed means includes a drive means for advancing a layer adjacent said electrodes while the tape electrode is wound on the spool. for allowing the layer to be advanced by the spool to compress 5 the web between the electrodes and for withdrawing the web from the electrodes as the tape electrode is wound onto the spool.
  • the apparatus of claim 11 further including a tray biased to contact the backing electrode when the tape elec- 70 trode is wound on the spool to guide a web to a position adjacent the path traveled by the spool and to support the web after its separation from the electrodes.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Replacement Of Web Rolls (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
US872850A 1969-10-31 1969-10-31 Manifold imaging system Expired - Lifetime US3642363A (en)

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US87285069A 1969-10-31 1969-10-31

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US (1) US3642363A (enrdf_load_stackoverflow)
JP (1) JPS4932349B1 (enrdf_load_stackoverflow)
CA (1) CA960289A (enrdf_load_stackoverflow)
DE (1) DE2052943A1 (enrdf_load_stackoverflow)
GB (1) GB1328405A (enrdf_load_stackoverflow)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54134465U (enrdf_load_stackoverflow) * 1978-03-09 1979-09-18
JPS5599979U (enrdf_load_stackoverflow) * 1978-12-30 1980-07-11

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3393617A (en) * 1965-01-25 1968-07-23 Gen Electric Recording apparatus comprising a photosensitive member, a recording member, and an ion exchange membrane

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3393617A (en) * 1965-01-25 1968-07-23 Gen Electric Recording apparatus comprising a photosensitive member, a recording member, and an ion exchange membrane

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GB1328405A (en) 1973-08-30
JPS4932349B1 (enrdf_load_stackoverflow) 1974-08-29
CA960289A (en) 1974-12-31
DE2052943A1 (de) 1971-05-06

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